Читать книгу Pump Wisdom - Robert X. Perez - Страница 17

After the pumped fluid (also labeled pumpage, or flow) leaves at the impeller tip, it must be channeled into a stationary passageway that merges into the discharge nozzle. Many different types of passageway designs (single or multiple volutes, vaned diffusers, etc.) are available. Their respective geometry interacts with the flow and creates radial force action of different magnitude around the periphery of an impeller (Figure 1.9). These forces tend to deflect the pump shaft; they are greater at part‐flow than at full flow.